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Abstract

The polarization dependence of quantum beats from the A-exciton and the B-exciton in a GaN sample of exceptional quality is studied with four-wave mixing experiments. When changing the incident polarizations from collinear to crossed linear, a π-phase shift of the beats is observed while the decay rate remains unchanged. This confirms previous theoretical predictions.

The FWM signals in the direction 2k1 - k2 as a function of time delay τ between the pulse k1 and pulse k2 for collinear (a) and crossed linear (b) incident polarizations. Positive time delay is defined as pulse k2 arriving first.